Sean W. Kaloostian, MD

Medicare activity in 2024

Official CMS public-use data for Sean W. Kaloostian, data year 2024 (released May 21, 2026). It covers Original Medicare (fee-for-service) patients only, not Medicare Advantage or other insurance. It shows volume, not quality or outcomes. CMS hides any count of 10 or fewer patients.

Most frequent services

1. Critical care, first 30-74 minutes (99291)117 services
2. Subsequent hospital care with moderate levelof medical decision making, if using time, at least 35 minutes (99232)106 services
3. Initial hospital care with straightforward or low-level medical decision making, if using time, at least 55 minutes (99222)24 services

Chronic conditions among these patients

Share of this clinician’s Original Medicare patients with each condition, as published by CMS (it describes the patients, not the care given).

• High blood pressure75%
• High cholesterol75%
• Stroke or mini-stroke71%
• Diabetes52%
• Arthritis51%
• Chronic kidney disease44%

Hospitals where Sean W. Kaloostian works

Medicare's Facility Affiliation Data lists Sean W. Kaloostian at these hospitals (updated October 2, 2026). Each hospital page shows its address, phone, emergency services, Medicare rating and all its clinicians. Star rating and emergency services: Hospital General Information (CMS), data updated October 26, 2026.

• Kaiser Foundation Hospital, RiversideRiverside, CA · Acute Care Hospital · Medicare rating: 4 of 5 stars · Emergency services: listed by Medicare · CCN 050686
• Riverside Community HospitalRiverside, CA · Acute Care Hospital · Medicare rating: 2 of 5 stars · Emergency services: listed by Medicare · CCN 050022

Practice locations

Addresses where Sean W. Kaloostian is enrolled with Medicare (CMS data updated October 2, 2026).

• 3430 E La Palma AveAnaheim, CA 92806 (888) 988‑2800
• 3460 E La Palma AveAnaheim, CA 92806 (714) 644‑2010
• 4445 Magnolia AveRiverside, CA 92501 (951) 788‑3000
• 5475 E La Palma AveAnaheim, CA 92807 (714) 279‑6088
• 800 S Main StCorona, CA 92882 (951) 737‑4343

Group practices

Medicare enrollment lists Sean W. Kaloostian as a member of this group (CMS data updated October 2, 2026).

• Southern California Permanente Medical Group11,293 clinicians in the group

Specialties

• Neurosurgeryprimary

Find other Neurosurgery doctors in California →

Other neurosurgeons in Anaheim

Clinicians with the same Medicare primary specialty in Anaheim, CA — not a recommendation.

• Eric S. Stiner, MD
• Vincent J. Cheung, MD
• Omid R. Hariri, MD
• Allen Ho, MD
• Tina Lin, MD
• Richard A. Stea, MD
• Edward T. Chappell, MD
• Sooho Choi, MD

All neurosurgeons in Anaheim →

Other clinicians in Southern California Permanente Medical Group

Medicare enrollment lists these clinicians in the same group practice — not a recommendation.

• Arpita Gupta, MD
• John W. Schliekelman, PT
• Abigail A. Berry, MD
• Bella Seerke, MD
• David S. Condon, MD
• Jenny J. Seong, MD

Clinician information

Most corrections must be made at the source: clinicians update their NPI Registry record (NPPES) and their Medicare enrollment (PECOS); this page follows the next data release.

Sources

1. Facility Affiliation Data — Centers for Medicare & Medicaid Services (CMS), data updated October 2, 2026, retrieved October 29, 2026
2. Hospital General Information — CMS, data updated October 26, 2026, retrieved November 13, 2026
3. National Downloadable File (Doctors and Clinicians) — CMS, data updated October 2, 2026, retrieved October 29, 2026
4. Medicare Physician & Other Practitioners - by Provider — CMS, data year 2024, released May 21, 2026; Medicare Physician & Other Practitioners - by Provider and Service
5. NPI Registry — U.S. Department of Health and Human Services (NPPES), the clinician’s official record
6. Medicare Care Compare — official Medicare tool to look up clinicians